That will read all the jpg/png images in the current directory and write them, one by one, using the pipe, to the ffmpeg's input, which will produce the video out of it.

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'''Important:'''

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All images in a series need to be of the same size and format.

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'''Explanation:'''

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By telling FFmpeg to set the input file's FPS option (frames per second) to some very low value, we made FFmpeg duplicate frames at the output and thus we achieved to display each image for some time on screen :)